Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Correlated Electrons: Low-dimensional Systems - Materials 4
TT 49.4: Vortrag
Freitag, 30. März 2012, 10:15–10:30, H 3005
Magnetic properties and revisited exchange integrals of the frustrated chain cuprate PbCuSO4(OH)2 - linarite — •M. Schäpers1, A. U. B. Wolter1, F. Lipps1, V. Kataev1, S.-L. Drechsler1, S. Nishimoto1, R. Beyer2, M. Uhlarz2, J. Wosnitza2, B. Willenberg3,4, K. C. Rule3, S. Süllow4, and B. Büchner1 — 1Leibniz-Institut IFW Dresden, Dresden, Germany — 2Dresden High Magnetic Field Laboratory, Dresden, Germany — 3HZB für Materialien und Energie, Berlin, Germany — 4IPKM, TU Braunschweig, Braunschweig, Germany
We present a detailed experimental and theoretical study of the
frustrated s = 12 spin-compound linarite,
PbCuSO4(OH)2, with competing ferromagnetic nearest-neighbor
and antiferromagnetic next-nearest-neighbor exchange interactions.
Our experimental data are described using various theoretical
approaches to obtain the magnetic exchange interactions. These
main intrachain interactions are significantly larger as those
derived previously [1, 2], causing a shift of the frustration
ratio α ≈ 0.36 closer to the 1D critical point. ESR
and NMR at elevated temperatures indicate a highly frustrated
system with the onset of magnetic correlations far above the
magnetic ordering temperature TN = 2.8 K into a spin spiral
ground state. Linarite shows a complex magnetic phase diagram with
small saturation field, which makes it a prototype for
investigating the recently predicted spin multipolar order close
to the saturation field for such spin-chain compounds.
M. Baran et al., Phys. Stat. Sol. (c) 3, 220 (2006).
Y. Yasui et al., JPSJ 80, 033707 (2011).